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. 1990 May;64(5):2208–2216. doi: 10.1128/jvi.64.5.2208-2216.1990

Isolation and characterization of herpes simplex virus mutants containing engineered mutations at the DNA polymerase locus.

A I Marcy 1, D R Yager 1, D M Coen 1
PMCID: PMC249381  PMID: 2157881

Abstract

We have derived Vero cell lines containing the herpes simplex virus DNA polymerase (pol) gene that complement temperature-sensitive pol mutants. These cell lines were used to recover viruses containing new mutations at the pol locus. Two spontaneously arising host-range mutants, 6C4 and 7E4, were isolated. These mutants did not grow efficiently on Vero cells or synthesize late polypeptides but formed plaques on a cell line containing the pol gene (DP6 cells). Whereas mutant 6C4 specified a wild-type-size Pol protein, we detected no full-length Pol protein in 7E4-infected cell extracts. Complementation studies demonstrated that 6C4 and 7E4 contain different mutations and indicated that 6C4 is in a complementation group different from that of pol temperature-sensitive mutant tsC7 or tsD9. A mutant in which 2.2 kilobases of pol sequences were replaced with the Escherichia coli lacZ gene under the control of the herpes simplex virus thymidine kinase promoter was constructed. This mutant formed blue plaques on DP6 cells in the presence of 5-bromo-4-chloro-3-indolyl-beta-D-galactoside. Using this virus in marker rescue experiments, we engineered three mutants containing deletions in the pol coding region which grew efficiently on DP6 cells but not on Vero cells and which differed in their synthesis of Pol polypeptides. The lacZ insertion virus was also used to introduce a deletion in the region upstream of the pol long open reading frame, which removes a short open reading frame that could encode a 10-amino-acid peptide. This mutant grew to similar titers on Vero and DP6 cells, indicating that these sequences are not essential for growth of the virus in tissue culture.

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Selected References

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